Strix occidentalis vs owl

Strix occidentalis and owl both are nouns.

Word	Noun	Adjective	Verb	Adverb
Strix occidentalis	Yes	No	No	No
owl	Yes	No	No	No

As nouns, owl is a hypernym of Strix occidentalis; that is, owl is a word with a broader meaning than Strix occidentalis:

Strix occidentalis: a large owl of North America found in forests from British Columbia to central Mexico; has dark brown plumage and a heavily spotted chest
owl: nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes

Other hypernyms of Strix occidentalis include bird of Minerva, bird of night, hooter.

Strix occidentalis (noun)	owl (noun)
a large owl of North America found in forests from British Columbia to central Mexico; has dark brown plumage and a heavily spotted chest	nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes